linux-kernel - Re: [PATCH] rcutorture: avoid format string leak to thead name

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Message-ID: <20140522211543.GA11775@jtriplet-mobl1>
Date:	Thu, 22 May 2014 14:15:43 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] rcutorture: avoid format string leak to thead name

On Thu, May 22, 2014 at 11:51:04AM -0700, Kees Cook wrote:
> Since the rcutorture thread creation interface does not include format
> string arguments, make sure the name can never be accidentally processed
> as a format string.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Josh Triplett <josh@...htriplett.org>

>  kernel/torture.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/torture.c b/kernel/torture.c
> index acc9afc2f26e..9dad2ffaf995 100644
> --- a/kernel/torture.c
> +++ b/kernel/torture.c
> @@ -694,7 +694,7 @@ int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
>  	int ret = 0;
>  
>  	VERBOSE_TOROUT_STRING(m);
> -	*tp = kthread_run(fn, arg, s);
> +	*tp = kthread_run(fn, arg, "%s", s);
>  	if (IS_ERR(*tp)) {
>  		ret = PTR_ERR(*tp);
>  		VERBOSE_TOROUT_ERRSTRING(f);
> -- 
> 1.7.9.5
> 
> 
> -- 
> Kees Cook
> Chrome OS Security
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